Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o radical com gǔ e contagem de traços 7?
 ###Tabelas: CREATE TABLE post_positions (post_positions_id AUTO_INCREMENT PRIMARY KEY, Finished INT, Time/ Behind VARCHAR, Post INT, Horse VARCHAR, Jockey VARCHAR, Trainer VARCHAR, Owner VARCHAR) CREATE TABLE 2009_2010_table (2009_2010_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try bonus VARCHAR, Losing bonus VARCHAR, Points VARCHAR) CREATE TABLE world_championship_group_b_austria (world_championship_group_b_austria_id AUTO_INCREMENT PRIMARY KEY, Games INT, Drawn INT, Lost INT, Points difference VARCHAR, Points INT) CREATE TABLE table_of_radicals (table_of_radicals_id AUTO_INCREMENT PRIMARY KEY, Radical (variants) VARCHAR, Stroke count INT, Pīnyīn VARCHAR, Hiragana - Romaji VARCHAR, Meaning VARCHAR, Frequency INT, Examples VARCHAR) CREATE TABLE tests_conducted_by_aqsiq (tests_conducted_by_aqsiq_id AUTO_INCREMENT PRIMARY KEY, Producer VARCHAR, Product VARCHAR, Samples taken INT, Samples failed INT, Melamine content(mg/kg) VARCHAR)  
SELECT Radical (variants) FROM table_of_radicals WHERE Pīnyīn = gǔ AND Stroke count = 7